100% CRANBERRY JUICE: Cranberry juice is sold in many varities. Be sure to buy 100% cranberry juice that contains a blend of several other juices (you'll see this on the ingredients) rather than cranberry juice cocktail (it will make your punch too sweet) or pure cranberry juice (it will make your punch too tart). Ocean Spray and many other brands sell a 100% cranberry juice, this is what you want to use.